Rabara ya styrene-butadiene (SBR)

Rabara ya styrene-butadiene (SBR) ndiyomwe imagwiritsidwa ntchito kwambiri ndi rabala yopangira ndipo imatha kupangidwa ndi copolymerization ya butadiene (75%) ndi styrene (25%) pogwiritsa ntchito zida zoyambira zaulere.A copolymer mwachisawawa amapezeka.The microstructure wa polima ndi 60% -68% trans, 14% -19% cis, ndi 17% -21% 1,2-.Njira zonyowa zimagwiritsidwa ntchito powonetsa ma polima a polybutadiene ndi ma copolymers.Solid-state NMR imapereka njira yosavuta yodziwira microstructure ya polima.

Pakadali pano, SBR yochulukirapo imapangidwa pophatikiza ma monomers awiriwa ndi anionic kapena coordination catalysts.Copolymer yopangidwa imakhala ndi zida zabwino zamakina komanso kugawa kwapang'onopang'ono kwa maselo.Copolymer mwachisawawa yokhala ndi zotsatizana zotsatiridwa ingathenso kupangidwa poyankha pogwiritsa ntchito butyl-lithium, malinga ngati ma monomer awiriwo amalipira pang'onopang'ono.Ma block copolymers a butadiene ndi styrene atha kupangidwa munjira pogwiritsa ntchito kulumikizana kapena zopangira anionic.Butadiene polima poyamba mpaka itanyekedwa, kenako styrene imayamba polymerize.SBR yopangidwa ndi coordination catalysts imakhala ndi mphamvu zolimba kuposa zomwe zimapangidwa ndi oyambitsa ma free radical.

Kugwiritsa ntchito kwakukulu kwa SBR ndikopanga matayala.Ntchito zina ndi nsapato, zokutira, zomangira pamphasa, ndi zomatira.

Mbali

Kukana kuvala, kukana kukalamba, kukana madzi ndi kutsekeka kwa mpweya kuli bwino kuposa mphira wachilengedwe, pomwe kumamatira, kukhazikika komanso kusinthika kwamtundu wa calorific ndizotsika kuposa mphira wachilengedwe.Rabara ya styrene butadiene imakhala ndi zinthu zambiri.Ndiwo mtundu waukulu kwambiri wa mphira wopangira, ndipo zotulutsa zake zimakhala ndi 60% ya mphira wopangira.Pafupifupi 87% ya mphamvu yopanga mphira ya styrene butadiene padziko lonse lapansi imagwiritsa ntchito emulsion polymerization.Nthawi zambiri, mphira wa styrene butadiene amatanthauza mphira wa emulsion polymerized styrene butadiene.Emulsion polymerized styrene butadiene labala imaphatikizaponso kutentha kwa emulsion polymerization ya butadiene styrene ndi kutsika kwa kutentha kwa emulsion polymerization ozizira butadiene.

Gwiritsani ntchito

Ntchito kupanga mphira siponji, impregnated CHIKWANGWANI ndi nsalu, komanso ntchito monga zomatira, ❖ kuyanika etc.